Intricate tubular casting and method of making same.



J. KRALUND.

INTRICATE TUBULAR CASTING AND METHOD OF MAKING SAME.

APPLICATION FILED MAY 8, 1918- Patented Dec. 3, 1918.

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lNVENTGR ATTORNEY J. KRALUND. INTRICATE TUBULAR CASTING AND METHOD OF MAKING SAME.

APPLICATION FILED MAY 8, 1918. 1,286,654, Patented Dec. 3, 1918.

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INVENTOR ATTORN EY UNITED I STATES PATENT ornroa.

JOHN KRALUND, OF BROOKLYN, NEW YORK, ASSIGNOR TO DOEHLER DIE CASTING COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

INTBIOATE TUBULAR, CASTING AND METHOD OF MAKING SAME.

Specification of Letters Patent.

Patented Dec... 3, 1918.

Application filed Kay 8, 1918. Serial 110. 233,197.

To all whom it may concern Be it known that I, JOHN KRALUND, a citizen of the United States, residing in the borough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Intricate Tubular Castings and Methods of Making Same, of which the following is a specification.

My invention relates to the manufacture of tubular castings, particularly die-castings of such intricate shape that the same cannot be produced by die-casting'methods previously in vogue. By my invention, I

roduce tubular die-castings containing iiends or elbows therein of such a nature that cores for the same, if used, could not be drawn after the metal'was cast. I produce such castings by using tubular cores, which are themselves preferably die-castings,'and positioning the same within the mold cavity 111 proper relation thereto. I use solid movable cores to close the outer ends of the tubular cores thus positioned, and to form end portions of the finished casting. When the parts are thus positioned, the desired casting is made within the mold about the tubular member or members and the solid movable end cores, the latter being drawn after the metal has sufficiently solidified. The outer casting thus formed adheres to the outer surfaces of the inner tubular member or members to form one integral or contiguous tubularmember of the desired intricate shape, the bore of the inner tubular members or castings constituting the bore of the coextensive portion of the finished casting. The inner member or members may be castings of such shape and length that the samennay be readily formedby the use of solid metallic cores which may be withdrawn, these inner tubular castings being properly connected or fitted together at their ends in proper position within the mold cavity. It will be noted that by this method, tubular die-castings may be produced having finished inner and outer-surfaces. My invention comprises both the method referred to above and the articles produced thereby as new articles of manufacture.

In order that a clearer understanding my invention may be had, attention is hereby directed to the accompanying drawin forming part of this a plication and illustrating the method referred to. In the draw-- shown; Fig. 2 represents a top plan-view of one of the inner tubular castings; Fig. 3 is a side elevation of the same; Fig. 4 1s a side elevation of the other inner tubular casting, there being two inner tubular castings in the embodiment of the invention shown in the drawings; Fig. 5 is a top plan view of the same; Fig. 6 is a top plan view of the twoinner castings assembled; Fig. 7 is a side elevation partly shown in section, of the mold or die shown in Fig. 1; Fig. 8 is a partial horizontal section through the mold showing the outer casting formed within the mold; and Figs. 9 and 10 are, respectively, a top plan view and a front elevation of the finished casting.

Referring to the drawings, a pair of inner tu ular castings 1 and 2 are shown, which are adapted to be secured together by a band-ringing fit at their adjacent ends, one of the same being formed with a peripheral shoulder 3 on its interior, and the other with a peripheral portion of reduced diameter at its end,this portion 4 fitting frictionally within the portion 3 of the other casting, as shown in the assembly view of the two members in Fig. 6. Members 1 and 2 are preferably metallic die-castings having smooth inner and outer surfaces, these parts being of such shape and curvature that they may be formed about solid cores which may be drawn after the metal has sufiiciently solidified. In the case of a member having a sharp bend therein, such as the inner casting 1. the same may be formed about a pair of cores which are drawn from the two ends. the inner ends of the cores meeting in a diagonal plane. As many inner tubular members of the character described as in necessary may be used.

The inner castings 1 and 2, being assembled as shown in Fig. 6. are po itioned in the impression of the. lower half 5 of. the metal die, the upper half of the die being partially shown in Fig. 1 at 6. The solid core pin 7 is fixedly mounted in the die and extends into the end 8 of the inner casting 1 when the castings 1 and 2 are positioned in the die. The core pin 7 is shown as riveted to the core plate 9, which is located in cordie, the. upper half of the mold or die being partly rect position, in relation to the die, by means of the posts or stops 10, 10.

A movable core pin 11 is used for forming the opposite end portion of the finished casting. This pin is slidably mounted able bearing member 12 and is provided with an end portion 13 adapted to closely fit within the outer end 14 of the inner casting 2. 1n the form of my invention illustrated, the core pin 11 is also provided with a portion 15 of larger diameter than that of the end 14 of member 2, this portion 15 being adapted to extend into the mold cavity and to abut against the end 14 of member 2 so as to provide a peripheral shoulder 16 surrounding the end 14 of member 2. When the members 1 and 2 are positioned in the mold cavity, with the end of core pin 7 extending into the outer end of member 1, the

outer ends of the inner core pin 11 is back, out of the way. When members 1 and 2 have been positioned, core pin 11 is advanced so that its end portion 13 will extend into member 2 with shoulder 16 abutting against the outer end of member 2, as shown in Figs. 1 and 8. Core pins 7 and 11 prevent the metal of the outer casting, when the same is made, from entering the castings. The portion 15 of core pin 11 and the corresponding portion 17 of core pin 7 within the mold cavity, are also adapted to form the end portions of the finished or outer casting.

The inner tubular castings 1 and 2 having been accurately positioned, and the core pin 11 moved forwardly as described, the

die is closed and the outer or finished cast ing made. Thegate is represented at 18 in the upper die member 6, this communicating with the mold cavity by a runner 19, this being partly in the die-section 6 and partly in the die-section 5. The metal flows around the inner castings 1 and 2 and the portions 17 and 15 of core pins 7 and 11, as shown in Fig. 8, to form the outer or finished casting 20, which, in the illustrative example shown in the drawings, is provided with straight end portions 21 and 22 and a body portion curving in different directions, as shown at 23 and 24 in Figs. 9 and 10. In the illustrative example given, the end portion 22 is formed with a larger internal diameter than the adjacent portion of the curved body of the casting, an annular shoulder 25 separating these portions. As is shown in Fig. 8, the inner tubular castings 1 and 2 form parts of the outer or finished casting, the metal of the outer casting adhering to the outer surfaces of the inner castings. After the metal has solidified sufficiently, the core pin 11 is withdrawn, the mold parts in a suitdrawn from the fixed core pin 7.

What I claim is 1. A process for casting a curved tubular member comprising, arranging a plurality of curved tubular castings in a mold with adjacent ends alined and connecting, positioning core pins in the outside ends, and making an outside casting within the mold and about said first-named castings and core pins.

2. A process for casting a curved tubular member comprising, forming a plurality of curved tubular members, arranging the same in a mold with adjacent ends alined and connecting, the connected members formin such a shape that a single core therefor could not be drawn tioning core pins in the outside ends, and making an outer casting within the mold and about said first-named castings and core pins.

3. A process for casting a curved tubular member comprising, arranging a plurality of curved tubular metal castings in a mold with adjacent ends alined and connecting, positioning core pins in the outside ends, to extend therefrom, making an outside casting within the mold and about said first-named castings and core pins, and drawing said-- pins, the bores of said first-named castings constituting the inner surface of the portion of the outside'casting coextensive therewith, after the latter has solidified.

4. A process for casting a curved tubular member of such shape that a solid core or cores for the same, if used, could not be drawn after the metal was cast, comprising, forming a tubular metal member of'complex curvature, having a bend therein, and end portions, at least one of which is directed at an angle to the adjacent portions of said member, arranging the same in a mold, positioning core pins in the ends of the member, to extend therefrom, making an outside casting in the mold and about said member and pins, and drawing said pins, the

'bore of said member constitutinothe inner surface of the portion of the outside casting coextensive therewith, after the latter has JOHN KRALUND from either outer end, posi- 

